do not report OOM error when prepareCall() failed

We have reported error in the function prepareCall(), and
the error is not only OOM error. So we should not report
OOM error in the function call() when prepareCall() failed.

src/remote/remote_driver.c

@@ -10832,7 +10832,6 @@ call (virConnectPtr conn, struct private_data *priv,
                            ret_filter, ret);
 
     if (!thiscall) {
-        virReportOOMError();
         return -1;
     }